Apparatus guaranteeing that a controller in a disk drive...

Details Apparatus guaranteeing that a controller in a disk drive... Apparatus guaranteeing that a controller in a disk drive...

G - Physics

06

F

352/21

G06F 3/06 (2006.01) G11B 5/012 (2006.01) G11B 5/09 (2006.01) G11B 20/12 (2006.01) G11B 20/14 (2006.01) G11B 27/28 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1215777

ABSTRACT Apparatus for providing a sequence detected signal indicating that a synchronization sequence occurring at regular intervals in a stream of data has occurred or should have occurred. The apparatus includes logic for detecting the synchronization sequence, logic responsive to the detec- tion logic for producing the sequence detected signal when the detection logic detects the sequence, and logic for producing the sequence detected signal at a fixed time after the synchronization sequence should have occurred. If the synchronization sequence did occur, the apparatus thus produces two sequence detected signals; however, the device receiving the sequence detected signal responds to the first sequence detected signal and ignores the second. If the synchronization sequence did not occur, the device receiving the sequence detected signal responds to the sequence detec- ted signal produced by the logic responsive to the timing apparatus. The apparatus thus guarantees that the device receiving the sequence detected signal will always receive such a signal. -1-

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